Home > Publications database > Rastertunnelmikroskopie und -spektroskopie an deponierten Einzelfullerenen: C$_{60}$, Ce@C$_{60}$ und La@C$_{60}$ |
Book/Report | FZJ-2020-00663 |
2000
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag
Jülich
Please use a persistent id in citations: http://hdl.handle.net/2128/24084
Report No.: Juel-3834
Abstract: In this PhD thesis the electronic properties of a C$_{60}$-fullerenes, pure and endohedral doped with Ce and La, has been measured on individual molecules.C$_{60}$, Ce@C$_{60}$ and La@C$_{60}$ were produced in a pulsed laser vaporizationcluster source, deposited on HOPG, and examined topographically and spectroscopicallywith a scanning tunnel microscope. It is shown that Ce@C$_{60}$ hasa reduced band gap in contrasting to pure C$_{60}$. La@C$_{60}$ even exhibits a vanishingbandgap. The I(V)-curve identifies La@C$_{60}$ to be metallic-like whileC$_{60}$ and Ce@C$_{60}$ show semiconducting character. Moreover La@C$_{60}$ shows areversible opening of a band gap of 40 meV at a transition temperature of 28K $\pm$ 1 K. The disappearing of the tunneling current at temperatures under28 K could be explained with the freezing of lanthaniums movement in theC$_{60}$-Fullerene.
The record appears in these collections: |